No water pressure after replacing stopcock

[SanJunipero]

Hi All

I had my rusty hot water stopcock replaced with a lever stopcock and had a mixer tap installed at the same time. I now have very low pressure in both the new mixer tap as well as my power shower. The repair company told me that the pressure is low because I had a mixer tap installed, but why would this affect my power shower?

My water tank is now also filling up incredibly slowly whereas before it was like a waterfall!

Any suggestions or advise as to what has happened?
The repair company are recommending that I need unvented cylinder at a cost of £2000…

[Gary C]

Stopcock ?

Thats normally the thing that isolates your house from the mains.

Did you have the float valve changed in the hot water tank ?

More details needed

[Black_S3]

Wrong way round with a check valve in it maybe?

[SanJunipero]

Sorry, excuse my ignorance. The thing in my boiler that shuts off the hot water to allow the sink to be replaced. I had that replaced as the old one was rusty and wouldn’t budge.

To do this he drained the tank and fitted a lever valve instead.

But now I have no pressure including from the power shower

[Robertb]

Must be the isolator tap on the tank surely… have you spoken to the guy who fitted it?

[SanJunipero]

I’ve asked him to come round next week, but they want to charge me a call-out fee even though I’m convinced they botched the original job.

[119]

Sounds like some debris had got lodged in the pipe.

[SanJunipero]

Thanks for the responses.

Is this an easy fix? Should I be paying for another call out?

Also any idea why the power shower is also running at low pressure now?

[Black_S3]

Maybe used a fitting that’s not full bore inside…. Can you post a picture of what was replaced?

[SanJunipero]

[SanJunipero]

Replaced with one of these

[CorradoTDI]

Can you take a pic of the actual valve fitted - suspect it's not full bore as someone else has said...

Also could be the mains valve (water metre) at the road / outside has not been opened fully.

You could ask your water firm to come out as test pressure too.

[SanJunipero]

[SanJunipero]

He didn’t touch the main stop outside my house, so I’m pretty sure it’s not that.

[Djtemeka]

SanJunipero said:

He didn’t touch the main stop outside my house, so I’m pretty sure it’s not that.

He would need to turn the water off outside in order to change the main valve inside

[Brinyan]

Possibly that the ball valve that fills the water tank in the loft has blocked/partially blocked, if the mains was turned off - debris could have come through when water was turned back on.
If the tank in the loft isn’t filling, it won’t fill the hot water cylinder & consequently won’t give a flow of water at hot water outlets.
Do the basin & bath hot taps flow properly?

[SanJunipero]

Yes the bathtub works fine, as does the toilet flush.

I may be wrong but I don’t remember him accessing the main valve outside at any point. All he did was drain the water tank (it’s a communal boiler).

[SanJunipero]

The tank doesn’t seem to be filling at all now, even after the toilet is flushed and bath taps have been turned on.

[Brinyan]

I’d get into the loft & look in the water tank to check it has water in it & fills when you hold down the ball valve. That then eliminates the cold water tank as the problem.
From there, it could be a blockage in a pipe, hopefully not, as that can be a pain to rectify.

[CambsBill]

Am I reading this wrong? Sounds like the plumber has shut off the supply to the header tank (either by closing a supply-side valve or tying up the stop cock. He's then replaced a valve between the header tank & the boiler. For me that would point the finger at whatever he did at the header tank as being the culprit.

OP, can you get to the header tank to see if the ball valve is working correctly? It should be sitting at the high water line (usually obvious, will be near the overflow outlet) & will allow water to flow if you push it down into the water.

Edit. Beaten to it

Edited by CambsBill on Tuesday 15th October 20:47